Add config settings for dev-mode database file name and http interface

[mckeeh3]

In some cases, it is helpful to change the default HTTP interface. Suggest the following setting to be consistent with setting the port:

akka.javasdk.dev-mode.http-interface = 0.0.0.0

Also, to change the persistence DB filename:

akka.javasdk.dev-mode.persistence.database = ./some-name.db

Example use case:

akka.javasdk.dev-mode.http-port = 9001
akka.javasdk.dev-mode.http-interface = 0.0.0.0

akka.javasdk.dev-mode.persistence.enabled = true
akka.javasdk.dev-mode.persistence.database = ./some-name.db